الفهرس 
Chapter (1): INTRODUCTIONOnly 14 pages are availabe for public view
 |  | from | 189 |  |  |
| | | from | 189 | | |
Abstract
Previous studies have shown that fibers improve concrete performance
specially in shear, steel fibers were the most popular type of fibers
introduced as an effective solution increases shear resistance. The degree
of improvement gained in shear strength exhibited by Steel Fiber
Concrete, SFC, is dependent on a number of factors. Steel fiber was
chosen because of high ductile behavior that this type of fibers adds to
concrete.
The principle objective of this study is to investigate the shear capacity
and shear response of low volume steel fiber concrete due to two types
of loading defined as static and repeated. Low volume fibers had chosen
to find an economic solution for using steel fibers in practice (Vf < 1 %)
with a guaranteeing suitable workability.
Forty two push-off specimens were tested to investigate the shear
strength variation for SFC - with low fiber content - under direct shear
static and repeated stresses. Three groups of concrete with different
compressive strength had prepared. Two types of steel fibers (corrugated
and hooked end steel fiber) with three volume content (0.15, 0.30 and 0.
45) %.
It was observed from the experimental results that the steel fibers
enhance the shear capacity of concrete with steel fibers up to 25 %
compared to plain concrete shear capacity, also steel fibers increase
fatigue life. Results showed that the corrugated steel fiber shape gave
some high performance rather than hooked end steel fiber shape. Based
on fatigue test results for tested specimens, an empirical equation
(regression analysis) is proposed to predict the fatigue life of SFC.